Bought a new Performance clutch set, and the pressure required to engage the pressure plate is 35-40% bigger than stock. My Clutch master cylinder is already in rough shape. Is there any other replacement i can use that might deal with the new clutch pressure better, perhaps one with a larger bore, maybe from another car? I would figure the install would be fairly easy even if you had to fab it, and making up a new hard line is not much trouble. Any ideas? I've felt some really tough mustang stock clutches, they are probably built to handle more pressure. Would a second gen Clutch MC fit, or be any better?

Thanks, Matt

 

A new stock one will handle it, clutch pedal will be a bit stiffer. I don't know if the TII ones will fit without modification or not. Iirc the bore is slightly larger and the slave is different too (S4).

 

Is there any benifit with the second gen N/A models? Larger bore? cause not many junkyards round here have TIIs around. If i find a similar looking MC from another car, whats the worst that would happen, having to redrill mounting holes, and make up a new hardline doesn't sound like very much work at all. Or am i dreaming?

 

If you think about how it works,a larger bore MC will make the push even harder.If you want more mechanical advantage over the clutch slave,youll need a smaller bore MC with a longer stroke......(the small gear easily turns the big gear = mechanical advantage to the small gear.....get it?)
Thats why a tiny little pump on a bottle jack can lift 10 tons of weight.It might take 30-40 strokes of the handle,but you can do it easily with one hand.The small pump has mechancial advantage over the large ramrod.

Or move the MC pushrod closer to the pivot point of the clutch pedal.Either way,youll have to push the clutch pedal a furthur distance to displace enough fluid.Most sports car drivers prefer a short travel clutch pedal for quicker shifts,so neither is a very desireable option.Or you could source a longer clutch fork that will work,and space the slave cylinder up to increase leverage on the fork.